Bag liner



1927' F. E. ROTHERMEL INVEN TOR.

? A TTORNEYS.

1,614,993 1927' I F. E. ROTHERMEL BA G LINER Filed Feb 20, 1924 2 spears-sneer 2 m A TTORNEYS.

i INVENTOR.

Patented Jan. 18, 1927.

UNITED STATES PATENT OFFICE.

BAG LINER.

Application filed February 20, 1924. Serial No. 693,993.

This invention relates to paper liners such as are used in burlap bags and the like to prevent the sugar, salt or other contents from sifting through the bag, such liners being usually made'of heavy crepe paperso that they will stretch or expand circumferentially of the bag as it is distended by its contents.

The objects of the present invention are to obtain such a circumferentially ex ans'ible bag liner which shall also have a ottom that is capable of expanding radially, or longitudinally of the creases of the cre e paper, so as to allow for distention of the bottom of the bag under the weight of its contents; to thus secure a bag liner which 'will not be ruptured by the weight of the contents" of the bag, and avoid waste and loss; to secure a construction of expansible bottom which issimple and easily manufactured, and that at'the same time is very effective; to utilize the peculiar properties ofcrepe paper in securing an expansible bottom, and to obtain other advantages and results as may be brought out bythe fo lowin description.

Re erring to the accompanying drawings,

in which like numerals of reference indicate the same parts throughout the several views, Figure 1 is a side view of a bag liner of my improved construction;

Figure 2 illustrates the crepe paper of which the bag liner is formed and which.

is expansible transversely of the bag only;

Figure 3 is detail view of one of the bottom corners of the bag liner inverted;

Fi re 4 is a section of one of the corners ofthe bag liner showing the seams;

Figure 5 illustrates how the bottom of the bag liner expands in use the dot and dash llnes showing how its sides may also e and;

igure 6 is a detail sectional view of the bottom e anded;

Figure shows two sheets of crepe paperout of which my improved bag liner is made;

Figure 8 shows said sheets superposed and stitched together at one end of themselves; s

Figure 9 shows the two sheets doubled outwardly apart and brought together at shown in Figure 9.

the opposite side of their stitched ends to form the bottom of the liner; I

Figure 10 shows how the side edges of the sheets are folded over and stitched, and Figure 11 illustrates the bottom of the complete liner, in invertedposition.

In said drawings, 1,-1 indicate two sheets of heavy crepe paper of the kind usually .employed for bag vliners and from which two sheets my improved bag liner is preferably formed. T e sheets are laid flatwise together, each with its wrong side outermost, and then they are doubled overat one end, as at 2 in Figure 8, and stitched, as at 3. The pressure of this doubling and stitching tends to flatten the usual foldslor creases of the 'crepe paper and thus increases its width, such increase resulting an a curved seam, as clearly shown in Figure 8.

The two'sheets 1, 1 are next folded outwardly apart" from each other and brought with their wrong sidestogetherat the opposite side of the bottom seam .4, so that said seam is enclosed between the sheets, as

The sheets where they fold,.as indicated by reference numerals 5, 5 in Figure'9, are" ressed and flattened somewhat and the efect of this is to produce an inward curve i as shown in Figures 1 and 11, particularly as the crepe pa er resumes its normal form The result is that the after such fol s. bottom of the bag as seen in side View is curved toward its open end althou h ,not

so sharply as the curvature of theottom seam 4; The side edges of the sheets 1, 1 are folded over, as at 6, 6 in Figure 10, and stitched as at-7, 7, although they may be closed in any other desired way which does not interfere with the shaping of the bottom as described.

The result is a bagliner such as show'nvin' Figures 1, 3 and 4, having an upwardly curved bottom 8 in side view and a still more sharply curved bottom seam 4, so that the inturn'ed plait gradually increases in depth from the corners of the bag towards its middle.- The result is that when the bag liner is inside of a bag which is filled, as with sugar, the bottom of the liner can expand laterally as well as circumferentially to accommodate the bulged shape of the bottom of the bag, as illustrated in Figures 5 and 6. There is thusno rupturing of the bag liner-due to the weight of the contents of the bag, especially as the amount of expansion can be increased by increasing the width of the plait 9 in folding the sheets '1, 1 of which the liner is made. My improved liner naturally assumes the shape of a filled bag, its corners fitting into the projecting corners of the bag and the middle part of its bottom widening and rounding under the weight of the contents as is common in bags. There is thus no tendency for the liner to become ruptured, and the contents of the bag are securely held against any escape through the loosely woven fabric .of the bag.

Various modifications and changes may be made in manufacturing my improved bag liner, by those skilled in the art, without departing from the spirit and scope of the invention, and I do not wish to be understood as restricting myself except as required by the following claims when construed in the light of the rior art.

Having thus describe the invention, what I claim is:

1. A bag liner having at its bottom an inturned plait increasing in depth from its ends toward its middle.

2. A bag liner having at its bottom an inturned plait increasing in depth from its ends toward its middle upon inwardly curved lines.

3. A bag liner of crepe paper with its creases or 'olds extending longitudinally of the liner, said liner having at its bottom an inturned plait increasing in depth from its ends toward its middle.

4. A bag liner of crepe paper with its creases or folds extending longitudinally of the liner, said liner having at its bottom an inturned plait increasing in depth from its ends toward its middle upon inwardly curved lines. 4

5. A ba liner of crepe paper with its creases or olds'extending longitudinally of the liner, said liner having seams at its side edges and at its bottom an inturned plait increasing in depth from its ends toward its middle.

6.-A bag liner having an inwardly curved bottom and thereat an inturned plait increasing in depth from its ends toward itsmiddle.

7..A bag liner having an inwardly curved bottom and thereat an inturned plait increasing in depth from its ends toward its middle upon inwardly curvedlines.

8. A bag liner of crepe paper with its creases or folds extending longitudinally of the liner, said liner having an inwardly.

curved bottom and thereat an inturned plait increasing in depth from its ends toward its middle.

9. A bagv liner of crepe paper with its creases or folds extending longitudinally of the liner, said liner having an inwardly curved bottom and thereat an inturned plait increasing in depth from its ends toward its middle upon inwardly curved lines.

10. A bag liner of crepe paper with its creases or folds extending longitudinally of -the liner, said liner having seams at its side edges-and an inwardly curved bottom with an inturned plait increasing in depth from its ends toward its middle.

11. A bag liner of crepe paper with its creases or folds extending longitudinally of the liner, said liner having seams at its side edges and aninwardly curved bottom with an inturned plait increasing in depth from its ends toward its middle upon inwardly curved lines.

12. The method of imparting to the bottom of a bag liner of crepe paper an inturned plait increasing in depth from its ends toward its middle, which consists of stitching together two superposed sheets of crepe paper at one edge transverse to the creases of the paper, turning said sheets inner sides out ,upon a transverse line adjacent said stitching, and stitching together their edges paralleled to the creases of the a er.

it), The method of impartingto the bottom of a bag liner of crepe paper an inturned plait increasing in depth from its ends toward its middle, whichconsists in stitching together two layers of crepe paper at one edge transverse to the creases of the paper and turning said layers inner sides out upon a transverse line adjacent said stitching.

14. A bag liner of crepe paper with its creases or folds extending longitudinally of the liner, said liner havin at its bottom a plait extending longitu lnally of the lower edge of the liner and stitched thereto at one end of said edge to hold said plait in position until a bag with the liner in it is filled, said plait being free for the portion of said edge intermediate its ends to expand upon such filling.

15. A bag liner of crepe paper with its creases or folds extending longitudinally of the liner, said liner having at its bottom and between its side walls an inturned fold:extending longitudinally of the lower edge of the liner and stitched thereto at one end of said edge to hold said plait in position until a bag with the liner in. it is filled, said plait being free for the portion of said edge intermediate itsjends to expand upon such filling.

16. The method of making a bag liner of crepe paper with its creases or folds extending longitudinally of the liner, which consists in forming at the bottom of the liner a fold extending longitudinally thereof to one side edge of the liner and subsequently stitching said side edge across the end of the fold, whereby the fold is held in place until expanded by filling a bag with the liner in it.

17. The method of'making a be liner of I crepe paper with its creases or fol s extending longitudinally of the liner, which con- I sists informing at the bottom of the liner an inturned fold extending longitudinally thereof to the side edges of the liner and 10 subsequently stitchin said side edges across the ends of the fol whereby the fold is held in place until expanded by filling a bag with the liner in it.

FREDERICK E. ROTHERMEL. 

